Drilling apparatus



Feb. 10, 1942. E. GERAGHTY DRILLING APPARATUS Filed Nov. 25, 195'? 2 Sheets-Sheet J.

.4 iidrneys Feb. 10, 1942. E. GERAGHTY 2,272,835

DRILLING APPARATUS Filed Nov. 25, 1937. 2 Sheets-Sheet 2 Inventor .l I Z: gravy/77 /0 zum A iiorneys Patented Feb. 10, 1942 ares ear ar 3 Claims.

The present invention relates to new and useful improvements in the art of earth drilling and has for its primary object to provide, in a manner as hereinafter set forth, a novel apparatus and method through the medium of which work of this nature will be greatly facilitated.

The foregoing and other objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a view in side elevation of an embodiment of the apparatus.

Figure 2 is an elevational view, taken at right angles to Fig. 1.

Figure 3 is a View in horizontal section, taken substantially on the line 3--3 of Fig. 2.

Figure 4 is a detail view in vertical section, showing the means used for mounting the drill on the casing.

Referring now to the drawings in detail, it will be seen that the embodiment of the apparatus which has been illustrated comprises a driven casing I. The casing I, after it has been driven, rises above the platform 2 and has threadedly mounted on its upper end portion a metallic flange 3, as illustrated to advantage in Fig. 4 of the drawings.

The reference numeral 4 designates generally a metallic frame structure comprising horizontal bars 5 (see Fig. 3) which are rigidly secured on the flange 3, as by bolts 6. Mounted on the frame structure 4 is a conventional core drill which is designated generally by the reference numeral 1. The drill I is driven by a belt and pulley connection 8 from an engine 9 which isalso mounted on a frame structure 4. The reference numeral Ill designates a drill rod connected to the mechanism 1 and which, as usual, is operable in the casing I.

It will thus be seen that the drill is mounted directly on the casing I. When preparing for a drilling operation, the casing l is driven through the material overlying the bed rock and seated in said bed rock. The rig is then secured in position on the upper end of the casing I through the medium of the flange 3, etc., or other suitable means and the apparatus is ready for operation. The construction and arrangement is such that when the rig is secured in position the drill rod will be automatically centered at all times and the drilling apparatus is automatically at right angles to the casing and drill cannot be caused to rise from the ground when hard rock is encountered for, of course, the casing would also have to be raised.

It is also an advantage over the existing method in that with the latter it is necessary to center the drill rods inside the casing by skidding the drill and engine forward or back and providing for unevenness in the surface of the ground by blocking up one corner of the rig or another. Also with this method there is no delay caused by the last length of easing driven being too long and having to be pulled out of the ground and replaced by a shorter piece. The need for this arises from lack of advance knowledge of the exact distance from the surface of the ground to the top of bed rock.

On marine work it has been the practice to drill from a scow which transmitted to the drill rod the motion caused by wave or wind action or to drive a large casing as a pile or spud on which is erected a platform to accommodate the conventional type of rig that must be skidded over the casing driven to bed rock as on land and to accommodate the crew.

The danger to life and property in using such a precarious method is obvious and the expense of its construction is another drawback. With our method which is the subject of this application there is no need for the drilling crew to leave the scow and the large casing need not be driven.

It is thought that the many advantages of the invention will be readily apparent from a consideration of the foregoing and although a preferred embodiment of the apparatus is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:

1. Drill apparatus for rotating a core drill in a hammer-driven over-burden casing extending above ground or water level, comprising in combinaticn a relatively light-weight frame, drill rotating and feeding mechanism mounted on said frame for receiving and rotating a drill rod connected to said core drill, a relatively lightweight engine also mounted on said frame, a driving connection between said engine and drill rotating and feeding mechanism, and means on said frame aligned with said drill rotating mechanism and concentric with said drill rod for supporting the frame on and securing it to the to of the casing. I

2. Drill apparatus for rotating a core drill in a hammer-driven over-burden casing extending above ground or water level, comprising in combination a relatively light-weight frame, drill rotating and feeding mechanism mounted on said frame for receiving and rotating a drill rod connected to said core drill, a relatively light-weight engine also mounted on said frame, a driving connection between said engine and drill rotating mechanism, and a threaded flange on said frame aligned with said drill rotating mechanism and concentric with said drill rod for threadedly engaging the top of the casing and supporting and securing the frame to the casing.

3. Drill apparatus for rotating a core drill in a hammer-driven over-burden casing extending above ground or water level, comprising in combination a relatively light-weight frame having a horizontal and a vertical section, drill rotating and feeding mechanism mounted at the top of said vertical section for receiving and rotating a drill rod attached to said core drill, a relatively light-weight engine mounted on said horizontal section of said frame, a driving connection between said engine and drill rotating mechanism, and a flange secured to said frame aligned with said drill rotating mechanism and concentric with said drill rod for receiving the top of said casing for supporting the frame on the top of 1 the casing. 

